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18 Direct-Fired Indoor and Outdoor Units • MUA-SVP01A-EN
Unit Operating Modes
Building Pressure Mode
The Building Pressure mode varies the percentages of outside air and return air
to maintain a constant pressure within the space. A pressure transducer
compares the pressure outside the space to the pressure inside the space and
transmits a corresponding signal to the AdaptAire controller. The controller
compares this signal to the desired building pressure setpoint and uses a PID
loop to modulate the outside air and return air dampers to maintain the specified
building pressure.
MDT and MRT Controls. The MDT and MRT control systems do not support
building pressure control mode.
MRT-Pro Controls. To change the damper mode on an MRT-Pro control system
requires the use of a BACview or PC. See the section related to the MRT Expert
for instructions on how to use the BACview for programming.
MRT-Expert Control. To place the damper operation in Building Pressure Mode
scroll through the menu tree, locate the Damper Mode branch and select Bldg Prs
Ctrl. Next, scroll through the menu tree, locate the Setpoints branch, select Bldg
Prs, and enter the desired pressure. The allowable range is -0.05"wc to +0.05"wc.
If the unit served by this control is a direct-fired heater, that recirculates air before
the burner, and is operating in the heating mode, the unit will automatically keep
the minimum outside air at 20%. If the outside air drops below 20%, the burner
will cycle off. See Minimum Ventilation.